... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... Little moon has big influence . ... Geysers on Saturn's little moon Enceladus are throwing off Saturn's internal clock, making it hard for scientists to measure the length of the Saturn day. ... No one could have predicted that the little moon Enceladus would have such an influence on the radio technique that has been used for years to determine the length of the Saturn day," said Dr. Don Gurnett of the University of Iowa, Iowa City. ...